获取已删除项目的计数并从下拉列表中删除最近的项目 [英] getting count of dropped items and removing recent items from drop list
问题描述
我正在做角度拖放.我的代码如下.
I am working on angular drag and drop. my code is as follows.
I am facing two issues in this.
-
每当我将数据拖放到完成"列表时,我都想知道要放入的项目的长度/数量.完成列表中已经有很多项目,并且假设我从待办事项"中拖放了两个项目.列出要完成的列表,那么我希望将其计数为2.如果拖放了3个项目,那么我希望将计数为3,依此类推.用我的意思是,我不想包含已经存在的数据.
whenever I drag and drop data to done list, I want to have the length/number of items I dropped. Done list already have many items in it and suppose I drag and drop two items from "To Do" list to done list then I want to have my count as 2. If 3 items dragged and dropped, then I want to have count as 3 and so on. Means in my count, I don't want to include data which is already present.
每当我将数据拖放到完成列表"X"时,标记仅按代码显示在最后一个项目上.假设我将item1拖放到完成列表中,然后将"X"拖放到完成列表中.将会出现在item1上,如果我放下item2,则"X"将出现在item2上.如果"X"如果点击了item2,则item2将被移动到"To do".再次列出.由于我拖放了两个项目,因此,如果用户单击"X",在项目2上,然后是"X";应该出现在item1上(不应出现在完成列表中已经存在的项目上).
whenever I drag and drop data to done list "X" mark appearing on last item only as per code. suppose I dragged and dropped item1 in done list then "X" will appear on item1 and if I drop item2, then "X" will appear on item2. If "X" if clicked on item2 then item2 will be moved to "To do" list again. Since I dragged and dropped two items, so in case if user clicks "X" on item 2 then "X" should come on item1(should not come on items already present in done list).
我该怎么办?
推荐答案
每当我将数据拖放到完成列表时,我都希望长度/我掉落的物品数.完成列表中已有很多项目并假设我从待办事项"中拖放了两个项目列出要做的事列表,然后我希望我的计数为2.如果拖动了3个项目,掉线,那么我想算为3,依此类推.在我看来,我不想包含已经存在的数据.
whenever I drag and drop data to done list, I want to have the length/number of items I dropped. Done list already have many items in it and suppose I drag and drop two items from "To Do" list to done list then I want to have my count as 2. If 3 items dragged and dropped, then I want to have count as 3 and so on. Means in my count, I don't want to include data which is already present.
您可以创建一个计数器,以跟踪列表中插入的元素.这是代码:
You can create a counter which keeps the track of inserted elements in the list. Here is the code:
import { Component } from "@angular/core";
import {
CdkDragDrop,
moveItemInArray,
transferArrayItem
} from "@angular/cdk/drag-drop";
/**
* @title Drag&Drop connected sorting
*/
@Component({
selector: "cdk-drag-drop-connected-sorting-example",
templateUrl: "cdk-drag-drop-connected-sorting-example.html",
styleUrls: ["cdk-drag-drop-connected-sorting-example.css"]
})
export class CdkDragDropConnectedSortingExample {
todo = [
"Get to work",
"Pick up groceries",
"Go home",
"Fall asleep",
"Walk Dog",
"Stretch",
"Code Stuff",
"Drag Stuff",
"Drop Stuff",
"Run",
"Walk"
];
done = ["Get up", "Brush teeth", "Take a shower", "Check e-mail", "Walk dog"];
lastElementDragged = null;
itemsDropped = 0;
initialListLength = this.done.length; //get initial length
drop(event: CdkDragDrop<string[]>) {
if (event.previousContainer === event.container) {
moveItemInArray(
event.container.data,
event.previousIndex,
event.currentIndex
);
} else {
this.lastElementDragged = this.done.length;
this.itemsDropped++; // keep the track of item inserted
transferArrayItem(
event.previousContainer.data,
event.container.data,
event.previousIndex,
this.done.length
);
}
console.log(this.getDroppedItems());
console.log(this.itemsDropped); // counter of values dropped in
}
handleTodoItem(index: number): void {
transferArrayItem(this.done, this.todo, index, this.todo.length);
this.itemsDropped--; // decrement on every remove
console.log(this.getDroppedItems())
}
getDroppedItems() {
return this.done.slice(this.initialListLength) && this.done.slice(this.initialListLength).length ?
this.done.slice(this.initialListLength) : 'Nothing Found';
}
}
每当我将数据拖放到完成列表"X"时,标记出现在最后项目仅按代码分类.假设我完成了拖放item1然后列出"X"将会出现在item1上,如果我放下item2,则"X"将要出现在item2上.如果"X"如果单击item2,则item2将被移动做"再次列出.由于我拖放了两个项目,因此用户点击"X"的情况在项目2上,然后是"X";应该放在第1项上(应该不在完成列表中已经存在的项目上.
whenever I drag and drop data to done list "X" mark appearing on last item only as per code. suppose I dragged and dropped item1 in done list then "X" will appear on item1 and if I drop item2, then "X" will appear on item2. If "X" if clicked on item2 then item2 will be moved to "To do" list again. Since I dragged and dropped two items, so in case if user clicks "X" on item 2 then "X" should come on item1(should not come on items already present in done list).
现在,上面的计数器可以帮助我们跟踪需要显示"X"按钮的项目.这是代码:
Now, the above counter can help us to track on what items we need to show the 'X' button. Here is the code :
<div class="example-container">
<h2>To do</h2>
<div cdkDropList #todoList="cdkDropList" [cdkDropListData]="todo" [cdkDropListConnectedTo]="[doneList]"
class="example-list" (cdkDropListDropped)="drop($event)">
<div class="example-box" *ngFor="let item of todo" cdkDrag>{{item}}</div>
</div>
</div>
<br>
<div class="example-container">
<h2>Done</h2>
<div cdkDropList #doneList="cdkDropList" [cdkDropListData]="done" [cdkDropListConnectedTo]="[todoList]"
class="example-list" (cdkDropListDropped)="drop($event)">
<div class="example-box" *ngFor="let item of done; let i = index" cdkDrag>
{{item}}
<span *ngIf="i > initialListLength - 1"" (click)="handleTodoItem(i)">X</span>
</div>
</div>
</div>
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